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pg.117

9 July 1945

I spent several hours in the control tower this morning.  It's a wooden structure about fifty feet high with scaffolding-like construction at the top of which is a platform about ten feet long and six feet wide.A roof supported by two-by-fours shaded shadded three benches and two chairs.  It was surrounded on four side by wooden boards reaching to a hight of about four feet.  Thus there was a considerable open area in the tower which afforded an unobstructed view in all directions.On the benches were several radio sets and a regular broadcast microphone.  Suspended from the roof on a pulley arrangement was a signal light not unlike a stubby wide gun barrel about six inches in diameter.  It had a regular gun sight along the edge for sighting and the front end, that is, the muzzle end, was a red-green dish and on the underside was a common trigger arrangement.  To be used in the event of radio communications failure, it is pointed at the aircraft and the trigger lights a powerful incandescent bulb inside.  If it is alright to land the pilot sees a green light flashed at him.  If not, the red.

With the use of a powerful pair of binoculars